When you have a jammed thumb it's much easier to play a thick-necked bass than a thin-necked bass. ![Tongue :P](https://bassoutpost.com/Smileys/default/tongue.gif)
Funny, I did mine last week and I noticed the same thing...it hurts less to play the G&L vice the Fury.
I'm still terrible, but I usually leave the wincing to everyone else in the house when I play.
Must be thumb-jam month in Raleigh...